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37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* Get the value of a semaphore. Generic version.
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Copyright (C) 2005-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <semaphore.h>
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#include <pt-internal.h>
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int
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__sem_getvalue (sem_t *restrict sem, int *restrict value)
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{
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struct new_sem *isem = (struct new_sem *) sem;
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#if __HAVE_64B_ATOMICS
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*value = atomic_load_relaxed (&isem->data) & SEM_VALUE_MASK;
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#else
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*value = atomic_load_relaxed (&isem->value) >> SEM_VALUE_SHIFT;
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#endif
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return 0;
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}
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strong_alias (__sem_getvalue, sem_getvalue);
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